Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbb11ddc3b9e40f…

MALICIOUS

PDF

69.0 KB Created: 2021-01-12 15:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 42d92ac37bcc4c99e0791507f00b6b75 SHA-1: 730e3cf1866813f94f0cc1b91b8db2363d08e2c7 SHA-256: dcbb11ddc3b9e40fe0362223638110a834d1f1678d9915a95ea85694e9a6124c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ggtraff.ru/aws?utm_term=carrom+board+game+online+free`. This URL is presented as a lure for a 'carrom board game online free', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/aws?utm_term=carrom+board+game+online+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5fbd00b52e8b2.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/aiezhnT/smoothie_maker_reviews_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/4TjenNN/my_photo_lyrical_video_status_maker_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5f9f6c7fcb2f8.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/IDfijif/marvelous_life_meaning_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_5fab9b036c502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f875bfdaaaf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5fbe97eb68980.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/WyjixUy/47384044287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5fe2f47f0b513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeroguru/mobile_hotspot_android.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/guided_busway_fares.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 5092 bytes
SHA-256: 9449dfe48cbd3539116e9c2eba27e95c0dff3c9787682d3994e995646f113dc6
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 10340 bytes
SHA-256: 1952e6effea96ff42564b3fe0088af262e5667886b5740ec7486e251c3b16cef